A Manhattan woman says co-op officials are trying to give her the boot because they think her live-in boyfriend is an illegal subletter.

Ellen Critcher, 62, is suing the board of her East 71st Street building on the Upper East Side.

She insists in Manhattan Supreme Court papers filed last week that she and her sweetie were widowed when they met six years ago and are now in a “committed, long-term relationship that is the equivalent of a nontraditional marriage under New York law.”

Yet the board members “persist in claiming that she is subletting” the one-bedroom apartment and that it is not her primary home.

Fact is, Critcher’s alleged nontraditional bliss is part of a new national norm. Statistics from the Pew Research Center reveal that a mere 51 percent of US adults were married in 2010 — a steep drop from the 72 percent in 1960.